diff options
author | Henrik <[email protected]> | 2018-05-29 10:47:25 +0200 |
---|---|---|
committer | Henrik <[email protected]> | 2018-05-29 10:47:25 +0200 |
commit | b9faca269de1de51ae33577cc204befbea24243c (patch) | |
tree | 5b0dedddf524df00c0377927c767ac2a25c3794f /lib/compiler/doc/src/notes.xml | |
parent | d3b4568f6d910eb4ce26b7a899c8c414ae252386 (diff) | |
download | otp-b9faca269de1de51ae33577cc204befbea24243c.tar.gz otp-b9faca269de1de51ae33577cc204befbea24243c.tar.bz2 otp-b9faca269de1de51ae33577cc204befbea24243c.zip |
Revert "Prepare release"
This reverts commit fd8e49b5bddceaae803670121b603b5eee8c5c08.
Diffstat (limited to 'lib/compiler/doc/src/notes.xml')
-rw-r--r-- | lib/compiler/doc/src/notes.xml | 213 |
1 files changed, 0 insertions, 213 deletions
diff --git a/lib/compiler/doc/src/notes.xml b/lib/compiler/doc/src/notes.xml index 357a940f24..bc1f68337b 100644 --- a/lib/compiler/doc/src/notes.xml +++ b/lib/compiler/doc/src/notes.xml @@ -32,219 +32,6 @@ <p>This document describes the changes made to the Compiler application.</p> -<section><title>Compiler 7.2</title> - - <section><title>Fixed Bugs and Malfunctions</title> - <list> - <item> - <p>Fixed an error in an optimization pass that caused - impossible tuple matching.</p> - <p> - Own Id: OTP-14855 Aux Id: ERL-549 </p> - </item> - <item> - <p>The exception thrown when a list comprehension was - given a non-list term was not always correct.</p> - <p> - Own Id: OTP-14992 Aux Id: ERL-572 </p> - </item> - </list> - </section> - - - <section><title>Improvements and New Features</title> - <list> - <item> - <p>Changed the default behaviour of <c>.erlang</c> - loading: <c>.erlang</c> is no longer loaded from the - current directory. <c>c:erlangrc(PathList)</c> can be - used to search and load an <c>.erlang</c> file from user - specified directories.</p> <p><c>escript</c>, - <c>erlc</c>, <c>dialyzer</c> and <c>typer</c> no longer - load an <c>.erlang</c> at all.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-14439</p> - </item> - <item> - <p>Support for "tuple calls" have been removed from the - run-time system. Tuple calls was an undocumented and - unsupported feature which allowed the module argument for - an apply operation to be a tuple: <c>Var = dict:new(), - Var:size()</c>. This "feature" frequently caused - confusion, especially when such call failed. The - stacktrace would point out functions that don't exist in - the source code.</p> - <p>For legacy code that need to use parameterized modules - or tuple calls for some other reason, there is a new - compiler option called <c>tuple_calls</c>. When this - option is given, the compiler will generate extra code - that emulates the old behavior for calls where the module - is a variable.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-14497</p> - </item> - <item> - <p>In code such as <c>example({ok, Val}) -> {ok, - Val}.</c> a tuple would be built. The compiler will now - automatically rewrite the code to - <c>example({ok,Val}=Tuple) -> Tuple.</c> which will - reduce code size, execution time, and remove GC - pressure.</p> - <p> - Own Id: OTP-14505</p> - </item> - <item> - <p>The optimization of <c>case</c> expression where only - one of the case arms can execute successfully has been - improved.</p> - <p> - Own Id: OTP-14525</p> - </item> - <item> - <p>Some uses of binary matching has been slightly - improved, eliminating unnecessary register shuffling.</p> - <p> - Own Id: OTP-14594 Aux Id: ERL-444 </p> - </item> - <item> - <p>There is a new <c>{compile_info,Info}</c> option for - the compiler that allows BEAM-based languages such as - Elixir and LFE to add their own compiler versions.</p> - <p> - Own Id: OTP-14615 Aux Id: PR-1558 </p> - </item> - <item> - <p>Loaded BEAM code in a 64-bit system requires less - memory because of better packing of operands for - instructions.</p> - <p>These memory savings were achieved by major - improvements to the <c>beam_makeops</c> scripts used when - building the run time system and BEAM compiler. There is - also new for documentation for <c>beam_makeops</c> that - describes how new BEAM instructions and loader - transformations can be implemented. The documentation is - found in here in a source directory or git repository: - erts/emulator/internal_doc/beam_makeops.md. An online - version can be found here: - https://github.com/erlang/otp/blob/master/erts/emulator/internal_doc/beam_makeops.md</p> - <p> - Own Id: OTP-14626</p> - </item> - <item> - <p>Size calculations for binary constructions has been - somewhat optimized, producing smaller code.</p> - <p> - Own Id: OTP-14654</p> - </item> - <item> - <p>When the value returned from a '<c>catch</c>' - expression is ignored, no stacktrace will be built if an - exception is caught. That will save time and produce less - garbage. There are also some minor optimizations of - '<c>try</c>/<c>catch</c>' both in the compiler and - run-time system.</p> - <p> - Own Id: OTP-14683</p> - </item> - <item> - <p>There is a new syntax in '<c>try/catch</c>' for - retrieving the stacktrace without calling - '<c>erlang:get_stacktrace/0</c>'. See the reference - manual for a description of the new syntax. The - '<c>erlang:get_stacktrace/0</c>' BIF is now - deprecated.</p> - <p> - Own Id: OTP-14692</p> - </item> - <item> - <p>The following is an internal change in the compiler, - that is not noticeable for normal use of the compiler: - The module <c>v3_life</c> has been removed. Its - functionality has been simplified and integrated into - <c>v3_codegen</c>.</p> - <p> - Own Id: OTP-14712</p> - </item> - <item> - <p>The optimization of binary matching that delays - creation of sub binaries (see the Efficiency Guide) could - be thwarted by the argument order and could be necessary - to change the argument order. The compiler has now become - smarter and can handle any argument order.</p> - <p> - Own Id: OTP-14774</p> - </item> - <item> - <p>When the compiler was faced with complex case - expressions it would unnecessarily allocate stack - elements and shuffle data between x and y registers. - Improved code generation to only allocate a stack frame - when strictly necessary.</p> - <p> - Own Id: OTP-14808 Aux Id: ERL-514 </p> - </item> - <item> - <p>There is a new option '<c>makedep_side_effect</c>' for - the compiler and <c>-MMD</c> for '<c>erlc</c>' that - generates dependencies and continues to compile as - normal.</p> - <p> - Own Id: OTP-14830</p> - </item> - <item> - <p>When compiling modules with huge functions, the - compiler would generate a lot of atoms for its internal, - sometimes so many that the atom table would overflow. The - compiler has been rewritten to generate far less internal - atoms to avoid filling the atom table.</p> - <p> - Own Id: OTP-14968 Aux Id: ERL-563 </p> - </item> - <item> - <p>External funs with literal values for module, name, - and arity (e.g. <c>erlang:abs/1</c>) are now treated as - literals. That means more efficient code that produces - less garbage on the heap.</p> - <p> - Own Id: OTP-15003</p> - </item> - <item> - <p>Two new guards BIFs operating on maps have been added: - <c>map_get/2</c> and <c>is_map_key/2</c>. They do the - same as <c>maps:get/2</c> and <c>maps:is_key/2</c>, - respectively, except that they are allowed to be used in - guards.</p> - <p> - Own Id: OTP-15037 Aux Id: PR-1784, PR-1802 </p> - </item> - <item> - <p>A call or apply of a literal external fun will be - replaced with a direct call.</p> - <p> - Own Id: OTP-15044 Aux Id: ERL-614 </p> - </item> - <item> - <p>Part of EEP-44 has been implemented.</p> - <p>There is a new predefined macro called - <c>OTP_RELEASE</c> which is an integer indicating the OTP - release number (its value is <c>21</c> in this - release).</p> - <p>There are new preprocessor directives - <c>-if(Condition).</c> and <c>-elif(Condition).</c>. The - <c>if/elif</c> supports the builtin function - <c>defined(Symbol)</c>.</p> - <p> - Own Id: OTP-15087 Aux Id: PR-1810 </p> - </item> - </list> - </section> - -</section> - <section><title>Compiler 7.1.5</title> <section><title>Fixed Bugs and Malfunctions</title> |